linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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Message-ID: <20100527215347.431c4934@lxorguk.ukuu.org.uk>
Date:	Thu, 27 May 2010 21:53:47 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Florian Mickler <florian@...kler.org>,
	Vitaly Wool <vitalywool@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul@...p1.linux-foundation.org, felipe.balbi@...ia.com,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

> > The event was not lost.
> 
> Not lost, but not delivered. So you need your policy agent to send 

it will be delivered next time the process wakes. It's not lost.

> SIGCONT when you receive any wakeup event, which either means proxying 
> all your network traffic through your policy agent or having some 
> mechanism for alerting the policy agent whenever you leave the deep idle 
> state.

You didn't mention that requirement last time.

> > > also the race of an application being in the middle of handling a wakeup 
> > > event when you send it the signal.
> > 
> > sigmask()
> 
> Doesn't help - I may be hit by the signal between the poll() unblocking 
> and me having the opportunity to call sigmask().

ppoll(). This is all existing solved stuff.

Alan
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